Offshore installation varies with the type of development involved.
1.Fixed platforms have the most work involved in an installation with Jackets and Decks needing to be transported to the well location. Jacket positioned and piled, deck lifted to Jacket and hooked up, commissioned.
2.FPSO Require the anchor buoys to be positioned and fixed at location prior to transport of vessel.
3.Semi-submersibles vessels require no offshore installation other than setting of drag anchors etc on arrival of vessel.
4.TLP unit require anchor bases laid sub-sea in readiness for the arrival of the TLP and then tension wires dropped, positioned and secured.
5.Sub-sea Templates and completions require transport to site, offloading to sea bed and coupling to pipelines.